Murata Unveils Miniature Power Supplies Aimed at Medical and Industrial Applications

Murata Power Solutions, the Massachusetts-based division of global electronics manufacturer Murata, announced March 29 that it had expanded its PQ line of open frame AC/DC converters with the new PQU1000 series. 

The series' supplies feature primary outputs of 12, 24, 48 or 54 V and meet EC62368-1 and EN60601-1 third edition standards for industrial and healthcare applications.

 

The PQU1000 series. Screenshot [modified] used courtesy of Murata Power Solutions

 

The new devices satisfy requirements for 2 x MOPP (means of patient protection) between primary and secondary, and 1 x MOPP between primary and chassis ground, making them suitable for Body Floating (BF) applications.

Optimized for free-air convection cooling, the new units are also suitable for use in low-noise environments. Members of the PQU series achieve efficiencies of 95%, and can deliver up to 800 W at 45 °C with convection cooling alone. In forced hot air setups, they can provide up to 1000 W at up to 50 °C.

 

PQU1000 Series Members 

The series’ supplies all operate over inputs ranging from 90 to 264 VAC. All units offer a 5 V, 0.5 A auxiliary output, and units designated for deployment with forced air cooling feature a 12 V, 0.6 A power supply for the fan.  The 5 and 12 V outputs can handle capacitive loads of up to 220 uF.

The four members of the series, and their single output voltages are as follows:

• PQU1000-12: 12 V output
• PQU1000-24: 24 V output
• PQU1000-48: 48 V output
• PQU1000-54: 54 V output

The 12, 24 and 48 V devices sport single output voltages that are adjustable to within -5% and +10% of their nominal values. The adjustment range of the 54 V PQU1000-54 is ±5%.

 

Current Sharing

Members of the PQU1000 power module series feature active current sharing. This allows for connection of the units in either non-redundant parallel, or parallel redundant deployments. Equal current share is maintained between the devices.

 

Important Specifications

Communication and Sensing

• Communication with the series member is simplified via an available power management bus (PMBus) protocol
• There is remote sensing for the main output

Electrical

• There are no minimum power load requirements
• Power factor is 0.95
• At 90 VAC, target hold up time is 10 ms
• Transient response for a 50% load step is ±5%
• Output voltage settling time to 1% of nominal value is 2 ms
• Turn on delay after input power is applied is 3 sec

Isolation

• Primary to Chassis: 1500 VAC
• Primary to Secondary (2 x MOPP): 4800 VAC
• Secondary to Chassis: 1500 VAC
• Main Output to 12 V and or 5 V outputs: 1500 VAC

 

Applications

• Healthcare applications, including:
  – Hospital bed sensing
  – Ventilators
  – Blood analysis equipment
• Factory automation
• 3D printing
• Displays
• Test and measurement
• Broadcast
• Power over Ethernet (PoE)

 

Physical Considerations

The devices all feature 127 x 203.2 mm (5 x 8 inch) industry standard footprints with a “U” channel form factor, as well as industry standard mounting footprints.

 

A schematic of the PQU1000 series' dimensions and layout. Screenshot used courtesy of Murata Power Solutions

 

Height:

• 39.97 mm maximum overall “U” Channel height
• 45.60 mm nominal overall height with cover
• 67.93 mm nominal overall height with integral fan cover

 

EMC Compliance

PDU series members are designed to comply with IEC60601-2 4th edition EMC standard requirements 

 

Environmental Notes

Members of the PQU100 series are RoHS-compliant

 

Feature image used courtesy of Murata Power Solutions